====== Test-Sample ======

  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=array
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=bibtex
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=dc
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=extpp
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=json
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=openurl-kev
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=rdf
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=text
  * http://t.r0s.de/s/uc/unAPI.php?id=197297730&format=xml